If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Zhubei: The hottest months are usually July and August with an average temp of 83°F, while the coldest months are January and February with an average of 64°F. The rainiest months in Zhubei are August, June, May, and September, with each month seeing an average of 8 inches of rainfall.